Make your life easy and use one of these. I have one installed for about 15 years.
All solid state stuff. Easy to install, run the 12V in and 6V constant voltage on the output. You can run 12V bulbs on the gauges too.
https://www.ronfrancis.com/product/159
Check your wiring diagram regarding the headlight switch. Power comes in on the
fuse side.
What about turn signals?